3 8
Example of combined circuit wiring
Figure 6.3
The number of detectors in AL should be such that the total current consumption of all detectors in
standby mode would be not more than 3 mA. The maximum number of active detectors in one AL should be
not more than 15. Up to 25 passive detectors can be interconnected in one AL.
CLR_a (active detectors) – 680 Ohm
CLR_p (passive detectors) – 1,2 kOhm
EOL resistor – 2,4 kOhm
Example of wiring of detectors like SPD-3.2, SPD-3.3 in 4-wire AL
Figure 6.4
According to EN 54:2-2003 up to 32 detectors can be interconnected in one AL.
It is recommended to use detectors with inbuilt Rd resistors, nd at the end of the loop - to use the
B100M base.
CLR=680Ohm
EOL resistor=1,5kOhm
